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Discontinued Operations and Dispositions - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 29, 2024 | Apr. 01, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Business Acquisition [Line Items] |  |  |  |  |  |
Net gains |  |  | $ 8,601 | $ 0 | $ 10,478 | $ 0
Performix Metallurgical Additives, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Proceeds from sale of business, gross of adjustments |  | $ 17,500 |  |  |  |
Net gains |  | 1,800 |  |  |  |
Gain on sale of business, net of tax |  | $ 1,300 |  |  |  |
Reed Minerals, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Proceeds from sale of business, gross of adjustments | $ 45,000 |  |  |  |  |
Net gains | 8,700 |  |  |  |  |
Gain on sale of business, net of tax | 2,800 |  |  |  |  |
Accounts receivable | 9,900 |  |  |  |  |
Inventory | 7,100 |  |  |  |  |
PPE | 10,700 |  |  |  |  |
Goodwill | 13,700 |  |  |  |  |
Accounts payable | $ 6,900 |  |  |  |  |
Harsco Rail Segment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Reduction in carrying amount of assets |  |  | $ 10,700 |  | $ 10,700 |

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